First slide

Ionization constants of weak acids, PH of weak acids

Question

Degree of ionization of ${CH}_{3} COOH$ is 0.1. Dissociation constant of its 0.01M solution at the same temperature will be

Easy

A

$10^{- 3}$
B

$10^{- 7}$
C

$10^{- 5}$
D

$10^{- 4}$

Solution

$k_{a} = \frac{{Cα}^{2}}{1 - α} k_{a} = \frac{0 .01 {(0 .1)}^{2}}{1 - 0 .1} k_{a} \approx 10^{- 4}$

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